Guess and check

Question

Mr. Akika has 53 18-cent and 28-cent stamps all told. The stamps are worth $12.94. How many of each kind of stamp does he have?

Answer 1

Hi Sydonia

If you meant to say that Mr. Akika has a total of 53 stamps, some stamps are 18 cent stamps and the others are 28 cent stamps. The total value of the stamps is 12.94.

You can use a system of equations

Let x = 18 cent stamps

Let y = 28 cent stamps

In terms of cost, 18 cent is $0.18 and 28 cent is $0.28

For total stamps

x + y = 53

y = 53 - x

For total cost

0.18x + 0.28y = 12.94

You can use the substitution above to put the cost in terms of x and solve for x.

Can you continue or do you have more questions please let me know?